Why Does Unlocking The Door or Trunk Set Off The Alarm?
Technical Service Bulletin (TSB) #[TSB_93-007|93-007], "Unlocking the Door Sets Off the Security Alarm"
The factory alarm should not be set off by unlocking either door with the key. The TSB describes a problem caused by corrosion of the contacts of the anti-theft door lock switch, along with a 1.7 hour per door procedure for replacing it. The parts required are (left switch) 72154-SL0-A01 and/or (right switch) 72114-SL0-A01 along with 72137-SS0-001 (clip). Service Bulletin # 93-007 is a little involved because you have to take apart an electrical connector and if you don’t have the little tools you could mess something up.
At least one owner has also had the same problem with the trunk. Unlocking it with the key should not set off the alarm either. In this case, the cause was one of the two large gray connectors that plug into the security computer wasn’t fully plugged in. The owner suspects that when the dealer installed the keyless entry they pulled one connector (the keyless entry unit feeds in via one of the connectors) and didn’t get it plugged back in properly. The sensor wires from all the doors, hood, trunk, etc. go in via these connectors. It’s under the right side of the dash. To get at it remove the two rearmost screws on the plate covering the bottom of the glove box.
[MBA- 2000/2/13] Phantom alarms are usually caused by a door switch or trunk switch just barely out of adjustment, usually the drivers door or hood . Set the alarm, then tug on the doors / trunk / hood without actually opening the latch, one at a time, to see if you can set off the alarm. If you can, whichever door you tugged on to set it off needs the switch adjusted or replaced.
Disabling A Faulty Alarm
[MBA – 2000/2/13] To disable the alarm, the quick way is to unplug the hood switch, the two wire gray connector between the washer fill cap, blue, and auxiliary hood release lever, red. The alarm won’t set if it ‘thinks’ one of the portals is open.
Keyless Entry Operation Quirk
[VB – 99/6/29] Problem: Upon trying to unlock the NSX with the remote, sometimes the doors don’t unlock (tabs don’t pop up in the door) and you must try a second time where by then the remote unlocks the doors.
Test 1: Locked the car with the remote. Remote unlocks door on first try. Open door, lock it with the interior door lock switch and close door. Let alarm system arm until the security light starts flashing in short blips. Try the remote and it does NOT unlock the car on the first try. On the second try, the doors unlock normally. This was also tested with the passenger side door with the same results.
Test 2: Locked the car with the remote. Remote unlocks door on first try. Open door and close the door locking the car with the car key. Let alarm system arm until the security light starts flashing in short blips. Try the remote and it unlocks the car on the first try. This was also tested with the passenger side door with the same results.
Explanation: This unlocking problem is attributed to HOW you lock your car. After testing the keyless on my car extensively, what it boils down to is that you must lock your car with the keyless entry or with the key.
The system is not smart enough to detect when the door is locked using the interior door lock switch. When you lock your car this way, the keyless entry system "thinks" that the car is still unlocked even though it actually is. Hence, when you try to unlock your car with the remote on the first try, you are actually locking it. The second try is necessary to unlock the car.
By using your remote or car key to lock your car, you’re keyless entry will always unlock the doors on the first try. You just may want to get into the habit of using the interior door lock switch to lock the doors only when you are inside driving the car.
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